Did facebook just rediscover that mixins are an anti-pattern? I would have expected them to know that going in, figured they had just thought it was fine as long as they convinced people to use them very sparingly
If you could do it again, would you leave in mixins or would you keep them out?
I think if we had to do it again (and get to keep the knowledge of the last few years), we'd probably skip mixins. We'd surely do some other things differently too though :)